1210121317 has 2 divisors, whose sum is σ = 1210121318. Its totient is φ = 1210121316.

The previous prime is 1210121221. The next prime is 1210121321. The reversal of 1210121317 is 7131210121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 922276161 + 287845156 = 30369^2 + 16966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210121317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210121294 and 1210121303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210121327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060658 + 605060659.

It is an arithmetic number, because the mean of its divisors is an integer number (605060659).

Almost surely, 2^1210121317 is an apocalyptic number.

It is an amenable number.

1210121317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121317 is an equidigital number, since it uses as much as digits as its factorization.

1210121317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 1210121317 is about 34786.7980274126. The cubic root of 1210121317 is about 1065.6378487077.

Adding to 1210121317 its reverse (7131210121), we get a palindrome (8341331438).

The spelling of 1210121317 in words is "one billion, two hundred ten million, one hundred twenty-one thousand, three hundred seventeen".